By default, Pixel Press Floors gives you a lot for free: the entire editor, plenty of graphics, a decent number of alternate characters, and access to the in-app arcade. However, some of the more advanced features require IAP. At the time of writing, two ‘packs’ were available: Enemy Pack 1 (69p/99¢) and Power-Up Pack 1 (£1.49/$1.99). Enemies are placed on your floors using the Design section. During play, they wander back and forth along a platform; collide with one and you’re robbed of a block of health.
The power-ups are added at the sketching phase using a single filled block. In the Design tab, this can then be defined as a jetpack, time-freezer, invincibility/speed-up, coin-magnet, health pick-up or extra life.